The Cretaceous Fauna of Pondolaml. 287 



LAMELLIBRANCHIA. 



Family NUCULANID^. 

 Genus NUCULANA, Link. 



NuCUIiANA, Sp. 



Plate XXXIII., fig. 13. 



Three small specimens of Nuculana belonging to the same type as 

 N. lineata (Sowerby), and N. Forsteri (Miiller) were obtained by 

 Professor Gottsche from the matrix collected by Griesbach. The 

 shell is oval, slightly inequilateral, with the posterior end pointed, 

 and the anterior margin romided. The entire surface, except near 

 the postero-dorsal margin, is covered with strong, regular, concentric 

 ribs. The length is 5 mm. 



Family AKCID^. 



Genus AECA, Linngeus. 

 Arca, sp. 

 A single specimen of a right valve belonging to the Hamburg 

 Museum, is referable to Arca (restricted), but is too imperfect for 

 specific description. 



Genus BAEBATIA, Gray. 

 Barbatia meridian a, sp. nov. 

 Plate XXXIII., fig. 14. 

 Description. — Shell sub-quadrate, rounded, higher posteriorly than 

 anteriorly, moderately inequilateral, of small convexity. xAnterior 

 margin rounded, forming an obtuse angle with the hinge-line. 

 Ventral margin slightly convex, sloping posteriorly. Posterior 

 margin obhque, sinuous, forming an obtuse angle with the hinge- 

 line. Postero-ventral extremity rounded. Umbones rather small, 

 incurved, situated a little in front of the middle of the hinge-area. 

 No carina. The region behind a line drawn from the umbo to the 

 postero-ventral extremity is compressed and divided into two parts 

 by a median radial furrow. Hinge-area narrow, rather longer than 

 half the greatest length of the valve. 



